New ideas can come from anywhere, but are often hardest to find when you’re actually looking for them. However, I believe it’s possible to jumpstart your brain, even under pressure, by applying yourself to a bit of divergent thinking:

Divergent thinking typically occurs in a spontaneous, free-flowing manner, such that many ideas are generated in an emergent cognitive fashion. Many possible solutions are explored in a short amount of time, and unexpected connections are drawn. After the process of divergent thinking has been completed, ideas and information are organized and structured using convergent thinking.

Finally, and it may take more time for ideas to emerge this way, but TED really is an amazing resource for this kind of thing. I recently attended TEDxObserver, after which my head was swimming with ideas.